Question

Question Four: For the pin-jointed truss shown in Figure 4, 3m 12 KN 3m 30 kN 3m 15 kN 4m 4m 3m 3m 6m Figure 4. Calculate the reactions at A and B. (a) By inspection (involving no calculations), list all the zero force members. (b) (c) By method of joints, analyse joints T, S and N to determine the force in members ST NT, RS, SN, MN and RN. In your answer, you must state whether the members are in compression or tension. d By method of sections (and using the top portion of the truss), determine the forces in members GE, EH and HF. In your answer, you must state whether the members are in compression or tension

Answer 1

AW 3 m 3n) 3 m ク 5 kr 3nm 3m 3m 6m au ヲ|与-914. o ko 45-185 Va = -ve g indiclas ascumed direation s rong Nh l 4,0 kN downward.

-force (b) 3er。 mem bers- are meeti wO extmal adings op e Jo o orce is (Bere fre men ea ertional cBychd Joints doint T 2 kN 5 NT 30x5 3 5 @ Toint 's P. SN -fore membe)

e Joint N 5 시 Tout. 5 RAN onJoin as 8れcen in-fig, and assume -Take H-o af-the upper Partgt Trum

cep per ra i member ㈠sam indicates aasumed is worerng rds "Joinじmeant Compressive im nalure Ccompress ve